London Irish will also play French opposition in the next round in the shape of Pau after putting Auch to the sword at the Madejski Stadium.

Full-back Delon Armitage scored two of the Exiles' six tries as they led 35-6 at the break before easing to a 42-18 victory.

Saracens progressed on Friday with a comfortable 36-10 victory over Bayonne, a Richard Haughton hat-trick of tries helping secure a 60-31 aggregate win.

They will next face Italian club Overmach Parma, who overturned a 24-point deficit against Spanish outfit El Salvador to squeak through by two points.

El Salvador lock Carlo Del Fava was red-carded for over-vigorous rucking and
later suspended from all rugby for 10 weeks.

Clermont Auvergne (formerly Montferrand) will provide stern opposition for Scottish side Borders after back-rower Elvis Vermeulen scored a hat-trick of tries in a 51-6 crushing of Italian side Leonessa.